Environmental Engineering Reference
In-Depth Information
syngas composition in the anode at atmospheric pressure and 800
C and air
(
x
O
2
= 21%,
x
N
2
= 0.79) in the cathode. Assume that the cell
s reversible voltage
is 0.9 V, and all irreversibilities of the electrochemical process are included
in the equivalent cell resistance,
R
equiv
, which equals 5.5 × 10
−5
'
m
2
at
800
C. The irreversible cell voltage is 0.8 V. The fuel utilization (the ratio
of the fuel used to the total fuel provided to the fuel cell) at the anode
U
f
=
80% and the oxygen utilization at the cathode
U
O
2
= 15%. The cell
Ω
'
s active
area is 81 cm
2
.
a. Calculate the electricity produced.
b. Determine the amount of biosyngas equivalent required.
c. Calculate the airflow rate.
d. Assume the syngas required is generated from biomass gasification and the
total chemical energy input is 34 W. Determine the energy efficiency of the
conversion of biomass into electricity.
PROJECTS
P16.1
Visit a local gasifier-based power plant, e.g., processing biomass or coal; note
down the syngas composition including contaminants; and design a gas
cleaning system to upgrade the syngas for use in SOFCs.
P16.2
Visit a fuel cell lab, record the key characteristics of an SOFC, and measure
and compare the performance of the SOFC operating with different fuels,
e.g., hydrogen, carbon monoxide, or syngas.
P16.3
Thermodynamically evaluate the effects of biomass gasification technology,
e.g., different gasifier types and gasifying agents such as steam and air on
gasifier
-
SOFC system efficiencies.
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